A catalase-negative,non-spore forming,nonbranching,gram-positive rod that produces hydrogen sulfide when inoculated into triple sugar iron (TSI)agar is most likely:

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Erysipelothrix is the only catalase-negative,gram-positive,and non-spore forming rod that produces hydrogen sulfide (H₂S)when inoculated into TSI agar.Some Bacillus spp.also blackens the butt of TSI,but it is catalase-positive and produces spores.

A Catalase-Negative,non-Spore Forming,nonbranching,gram-Positive Rod That Produces Hydrogen Sulfide When Inoculated